Kratom (Mitragyna speciosa) is described as being a stimulant at low doses, and narcotic/sedative at higher doses. Dosages can vary greatly depending on the freshness of the leaf and the potency of the particular plant/strain. Fresh or freshly dried leaves are generally considered the most potent, but dried leaves are most common outside of SE Asia. Following are approximate dosages for oral (chewed or tea) dried and transported Kratom leaf in grams (as sold outside SE Asia).

IMPORTANT NOTE: There are four common grades of kratom leaves sold on the commercial market and each is a different potency. Some companies use the terms "Organic Commercial Grade" for the least potent (dosages 5-30 grams dried leaf), "Premium" or "Instant Premium" (dosages 2-15 grams), "Super" (2-8 grams) or "Super Enhanced" (dosages 1-5 grams).
Many vendors do not use these labels for their products and the potencies are not standardized in any way. From 2000 to 2003, kratom sales usually were of plain, commercial grade dried leaf and leaf powder. Since then, the potency of products has increased and Enhanced, Super, and Premium are now the norm in 2014.

Nausea, dysphoria and vomiting are likely with strong doses, especially in those not already experienced with the effects of kratom. It is important for kratom-tea drinkers to start low with the specific leaf material they have and slowly work the dosage up to avoid unpleasant effects.

A teaspoon of dried leaf is usually between 1.5 and 2.0 grams. 1 milliliter of dried leaf is usually between 0.3 and 0.4 grams.

Oral Kratom Dosages (dried leaf)

2014 Standard (formerly Super Grade)

Threshold

1-2 grams

Light

2-4 grams

Common

3-5 grams

Strong

4-8 grams

Please note that the dose charts below are for very low potency kratom leaf and leaf powders that are no longer commonly sold in 2014.

According to a report by the National Drugs and Poisons Schedule Committee of Australia, "Poisindex indicates that in adults, a dose of 50 mg of pure mitragynine has produced motor excitement, rombergism [unsteadiness on feet with eyes closed], giddiness and tremors of the face, extremities and tongue."

Erowid's dosage information is a summary of data gathered from users, research, and other
resources and should not be construed as recommendations. Individuals can respond
differently to the same dosage. What is safe for one can be deadly for another.